A system of microstructure-dependent fatigue failure models that allows calculating the
number of stress cycles to failure of smooth specimens in the absence of data on the fatigue
resistance of the material is proposed. Fatigue life is represented as the sum of the number
of stress cycles to the initiation of a microstructurally short crack with a depth equal to one
grain size and the number of stress cycles to the instant the growing physically small and
long crack reaches the depth taken as a fatigue failure criterion. To fill the models, it is …